Product Overview
Black Rectangular Steel Tube is manufactured by high-frequency welding using hot-rolled carbon steel strip, providing consistent dimensions, reliable weld quality, and stable mechanical performance for structural fabrication, machinery, construction, and industrial applications.
Specifications
|
Project |
Parameters |
|
Product Name |
Black Steel Pipe |
|
Shape |
Round / Square / Rectangular |
|
Outer Diameter |
Round: 10 mm – 219 mm Square: 10 × 10 mm – 200 × 200 mm Rectangular: 20 × 10 mm – 200 × 100 mm |
|
Wall Thickness |
0.5 mm – 10 mm |
|
Length |
3 m / 6 m / 9 m / 12 m or customized |
|
Material Grades |
Q195, Q215, Q235 (Equivalent to S235JR / ASTM A36), Q345 (Equivalent to S355JR / ASTM A572 Gr.50) |
|
Production Process |
High-frequency welding, hot rolling |
|
Surface Condition |
Black original pipe surface |
|
Standards |
ASTM / EN / GB, etc. |
|
Processing Services |
Cutting to length, punching, chamfering, welding, etc. |
Engineering Advantages
Formed on automated lines with controlled sizing to maintain stable dimensions and boost assembly efficiency.
High-frequency welding delivers continuous, uniform seams with dependable structural performance for load-bearing uses.
Clean black finish accommodates welding, cutting, bending, painting, or hot-dip galvanizing with minimal pre-treatment.
Offered in Q195, Q215, Q235, and Q345 grades to balance strength, weldability, and budget.
Custom dimensions, lengths, hole punching, beveling, and other processing services help reduce secondary machining and simplify procurement.
Processing Services
Cut-to-Length: Precision cutting to eliminate waste and match exact project blueprints.
Hole Punching & Drilling: Custom hole patterns designed for fast bolt connections and structural fasteners.
End Chamfering: Prepared bevels engineered for superior welding penetration.
Welding & Fabrication: Sub-assembly creation based on client design specifications.
OEM Marking: Stenciled or inkjet heat numbers, sizes, and standards for absolute clarity.
Quality Control & Traceability
Dimensional & Geometrical Verification: Outside dimensions, wall thickness, rectangular section squareness, and straightness.
Metallurgical & Mechanical Testing: Weld seam non-destructive testing (NDT), flattening/bending tests, and material grade verification.
Documentation & Traceability: Mill Test Certificates (MTC / EN 10204 3.1) are issued and supplied with every shipment, ensuring 100% material traceability from raw coil to final tube.
Packaging & Logistics Support
Export-Grade Packaging: Securely bundled with heavy-duty steel strips and wrapped with waterproof plastic film to prevent rust and impact damage during ocean transit.
Flexible Loading: Optimized container loading for 20GP/40GP or bulk vessel arrangements to maximize space utilization and minimize freight costs.
FAQ
Q: What standards can you produce to?
A: We manufacture Black Rectangular Steel Tube according to ASTM, EN, and GB standards, with products available for projects requiring EN 10219, ASTM A500, and other applicable specifications.
Q: Do you support custom sizes?
A: Yes. Custom dimensions, lengths, wall thicknesses, and processing services are available according to project drawings or technical requirements.
Q: Can the tube be galvanized after production?
A: Yes. The black original surface is suitable for hot-dip galvanizing, painting, powder coating, or other surface treatments required by the application.
Q: How do you ensure product quality?
A: Every production batch undergoes dimensional inspection, weld quality verification, surface inspection, and material confirmation under an ISO 9001 quality management system before shipment.
Q: What industries commonly use this product?
A: Black Rectangular Steel Tube is commonly supplied for construction, steel structures, machinery manufacturing, industrial equipment, storage systems, agricultural equipment, and general fabrication projects.
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